A waterborne parasitic infection acquired by drinking contaminated water, Guinea worm disease--or dracunculiasis--incubates in a person for about a year until a worm as long as 1 meter (3 feet) exits the body painfully and slowly from a blister in the skin. Guinea worm is spread only when humans drink contaminated water, and it can be eliminated through simple, low-technology measures, such as filtering all drinking water and educating people with emerging worms not to enter water sources.

With worldwide case reductions down by more than 99 percent since the beginning of the program, Guinea worm disease is poised to become the next disease after smallpox to be eradicated from Earth and the first to be wiped out without the use of a vaccine or medicine, and the first parasitic disease to be eradicated.

Despite the progress made in 2009, however, challenges to eradication remain. The last cases of any eradication campaign are the most difficult and expensive to eliminate. Although infected cases become fewer and far between, surveillance of countries, including the smallest communities in the most remote areas, must be intensified to prevent outbreaks and setbacks. In the case of Guinea worm disease, maintaining a broad and sensitive monitoring system over vast areas and providing a rapid response when necessary are expensive. Although surveillance is challenging, Guinea worm eradication is considered one of the most cost-effective public health efforts because of its relatively simple intervention measures.

The eradication of Guinea worm disease will prevent the suffering of entire communities and help keep citizens working and in school, rather than incapacitated by the disease, and is a community investment that will continue to grow indefinitely.  In addition, the campaign has shown the remarkable impact that health education can make; it is possible to change people's behavior to improve health on a global scale

*Includes five cases exported to Niger;  one from Ghana and four from Mali.